Rijndael encryption is an encryption algorithm utilized by AES (advanced encryption standard). “Rijndael” is a portmanteau of the names of Joan Daemen and Vincent Rijmen, the inventors of the algorithm.

Rijndael uses a design principle known as a substitution-permutation network, or an SP-network, to encrypt plaintext data. It uses several mathematical operations; decryption is performed by reversing the process. It has a relatively simple algebraic description, and runs very efficiently on both hardware and software implementations.

In 2009, several cryptographers exploited an aspect of the algorithm, known as its key schedule, to make an attack against the algorithm that was more efficient than a brute force attack.

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